"Fortunately for us, the app was written almost entirely in Objective C,
which meant that we'd be able to examine some of the app's source code
as it was written by Twitter's very own engineers; usually, when
disassembling C/C++ binaries, source code loses its original naming
symbology, but Objective-C preserves a lot of symbols which makes it
easier to follow along."

Then goes on to show how they investigated the code:

"Using a nifty tool called class-dump, we began examining the contents
of Twitter.app and how it was designed."

I think the question is...because of the way the code was presenting,
did this allow the folks "hacking" on this to do this sort of discovery
and is there an open source angle to that?